Re: [Patch] SMP call function cleanup

[James Bottomley <James.Bottomley@steeleye.com>]

On Thu, 2004-04-22 at 09:24, William Lee Irwin III wrote:
> Well, at the moment, anyone in need of IPI'ing > 1 cpu is IPI'ing all,
> which is not swift, so bear that in mind. Though given on_one_cpu(), I
> suppose they can do:
> 
> 	for_each_cpu_mask(cpu, foo->mask)
> 		on_one_cpu(cpu, bar, ...);
> 
> which more or less avoids IPI'ing 1024 cpus to run a function on 2 or
> whatever they were going on about, so they can likely code it that way.

But the key is 'anyone in need of'.  What I'd like is for you to
demonstrate a need of execute on cpumask before it gets added to the
API.  Murphy's law says that when given a choice people invariably make
the wrong one, so lets not introduce choice into the api unless it's
absolutely necessary.

James